neither too hard, nor too soft
... 入口和醇 mild and mellow 软硬适中 neither too hard nor too soft 散热迅速 rapid heat dissipation ...
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也有硬毛，软毛和软硬适中之分。
There is also hard, soft, and medium.
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通用型，软硬适中使用寿命一般。
SBC: Is universal, Medium life and hardness.
木材的软硬适中，触感温暖，还有良好的声学性能和调温、调湿等功能；
The wood is Moderate hardness, warm touching, and good for acoustic performance and temperature regulation, humidity controlling, etc;
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